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OC hd4870

post #1 of 8
Thread Starter 
hey guys, i've been trying to OC my card a bit, i manage to get 826mhz core and 1015mhz on memory, my question is, is it normal when i'm on desktop in idle the screen starting to flickering? but when i use gpu tool or run BF 3 it runs fine without any problems? but if i put the clocks to 790mhz core and 935mhz memory, the screen doesn't flicker.
But if i pass 800mhz on core it flickers again when i'm not doing anything. I'm using sapphire trixx to OC, gpu tool to test stability and catalyst to check temperatures and gpuz.
I'm using 790mhz core and 935mhz memory when i'm going to play games.
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post #2 of 8
Will you need a bump in voltage?
 
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post #3 of 8
Thread Starter 
Quote:
Originally Posted by alex-fitton View Post

Will you need a bump in voltage?

the voltage is on 1.263v and it doesn't let me mess with it, i think the 4xxxx don't allow to do that
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post #4 of 8
Quote:
Originally Posted by Kedas View Post

the voltage is on 1.263v and it doesn't let me mess with it, i think the 4xxxx don't allow to do that

Lucky your stock voltages are that high. My card has a default of only 1.1v, with no option of increase. Screw you XFX biggrin.gif
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A pleasant surprise :)
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by PunkX 1 View Post

Lucky your stock voltages are that high. My card has a default of only 1.1v, with no option of increase. Screw you XFX biggrin.gif

lachen.gif sapphire ftw biggrin.gif

still do you have any ideas or anyone else?
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post #6 of 8
I recently picked one of these up from the Newegg sale. I'm running 850 core/1100 memory with stock voltage. Admittedly, I haven't done any extreme stress testing. You can change the voltage on these cards though.

This program will allow you to change your voltage. It needs Rivatuner to work so be sure you have it installed as well. Instructions are included.

Edit:
I believe the flickering is due to PowerPlay but I'm not certain. I have it disabled with ATI Tray Tools which I also use to do my overclocking.
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post #7 of 8
Thread Starter 
Quote:
Originally Posted by tehmaggot View Post

I recently picked one of these up from the Newegg sale. I'm running 850 core/1100 memory with stock voltage. Admittedly, I haven't done any extreme stress testing. You can change the voltage on these cards though.
This program will allow you to change your voltage. It needs Rivatuner to work so be sure you have it installed as well. Instructions are included.
Edit:
I believe the flickering is due to PowerPlay but I'm not certain. I have it disabled with ATI Tray Tools which I also use to do my overclocking.

i powerplay is something to save power? i think i discovered why the flickering, its because the memory clocks, when i'm browsing on the web for example has off now, the memory clocks go from 900mhz to 1020mhz, guess it's from that, they never stay at 1020mhz
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post #8 of 8
Thread Starter 
Quote:
Originally Posted by tehmaggot View Post

I recently picked one of these up from the Newegg sale. I'm running 850 core/1100 memory with stock voltage. Admittedly, I haven't done any extreme stress testing. You can change the voltage on these cards though.
This program will allow you to change your voltage. It needs Rivatuner to work so be sure you have it installed as well. Instructions are included.
Edit:
I believe the flickering is due to PowerPlay but I'm not certain. I have it disabled with ATI Tray Tools which I also use to do my overclocking.

i'm using ati tray tools and it doesn't flicker anymore, it was from the powerplay, thx m8 thumb.gif
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